m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 23

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

Memory
Special function register (SFR) area
The special function register (SFR) area in the zero page contains
control registers such as I/O ports and timers.
RAM
RAM is used for data storage and for stack area of subroutine
calls and interrupts.
ROM
The first 128 bytes and the last 2 bytes of ROM are reserved for
device testing and the reset is user area for storing programs.
Interrupt vector area
The interrupt vector area contains reset and interrupt vectors.
Fig. 2 Memory map
RAM area
ROM area
RAM capacity
ROM capacity
(bytes)
1024
1536
2048
(bytes)
12288
16384
20480
24576
28672
32768
36864
40960
45056
49152
53248
57344
61440
192
256
384
512
640
768
896
4096
8192
Address XXXX
Address YYYY
00FF
013F
01BF
023F
02BF
033F
03BF
043F
063F
083F
F000
E000
D000
C000
B000
A000
9000
8000
7000
6000
5000
4000
3000
2000
1000
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
Address ZZZZ
F080
E080
D080
C080
B080
A080
9080
8080
7080
6080
5080
4080
3080
2080
1080
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
Zero page
The 256 bytes from addresses 0000
zero page area. The internal RAM and the special function regis-
ters (SFR) are allocated to this area.
The zero page addressing mode can be used to specify memory
and register addresses in the zero page area. Access to this area
with only 2 bytes is possible in the zero page addressing mode.
Special page
The 256 bytes from addresses FF00
special page area. The special page addressing mode can be
used to specify memory addresses in the special page area. Ac-
cess to this area with only 2 bytes is possible in the special page
addressing mode.
ROM
RAM
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
0FDF
XXXX
YYYY
FFDC
0F1F
0100
0440
0F00
0F80
FFFE
ZZZZ
FFFF
FF00
0000
0040
16
16
16
16
16
16
16
16
16
16
16
16
16
16
16
(common ROM area,128 bytes)
RAM area for FLD automatic display
MITSUBISHI MICROCOMPUTERS
RAM area for serial I/O automatic transfer
Reserved ROM area
Reserved ROM area
Interrupt vector area
Reserved area
SFR area
Not used
Not used
Not used
16
16
to FFFF
to 00FF
3819 Group
16
16
are called the
are called the
Zero
page
Special
page
9